Dimmers work well for a situation like this. You should be able to find one at walmart, home depot, or maybe even a pharmacy.

Boas are great. Usually very hardy and social. Just go easy on the feeding schedule. It will be hard, because boas tend to "beg" for food, but stick to a schedule and she won't grow too quicly or become obese.

Who did you purchase her from? If you bought her from a re-seller or big dealer (like LLL) she could be CA, but might be a normal BCI, so just keep the size potential in mind. You should know in a year or two though, the CAs tend to stay a lot smaller, even with a good feeding schedule and properly sized food. My CA is a LOT slimmer and smaller than my common hypo BCI.